Hofmeister is heading to the administration of his former boss, state Sen. Tom Croci (R-Sayville), to become his district director. Birbiglia declined to say what her next job will be. Their last day with Islip is Oct. 2.

Carpenter said when she was appointed supervisor in January after former Supervisor Croci was elected to the State Senate, she knew Hofmeister and Birbiglia might eventually leave their posts and asked them to stay to help with the transition.

Hofmeister served as deputy supervisor under Croci and acting supervisor during Croci's yearlong military deployment to Afghanistan from 2013 to 2014. Birbiglia also served as Croci's director of public information.

Carpenter appointed Birbiglia to oversee the cleanup of tons of toxic debris at Roberto Clemente Park in Brentwood, a massive project that Hofmeister also worked on, she said.

"I'm very, very grateful to the both of them," Carpenter added, calling them "true professionals." She said it was too early to announce their replacements or who would now handle the park cleanup and rehabilitation.

"I look forward to applying my career of public service in a new capacity and continuing important dialogue with Supervisor Angie Carpenter in my new role at the State level," Hofmeister said in a statement. "It has been a privilege serving under Supervisor Carpenter and my new position will provide continuity between these two levels of government to address the Town's needs."

In a statement, Birbiglia said: "I'm grateful to have been entrusted with the management of one of Long Island's most watched environmental cleanup projects, and have great faith that Supervisor Angie Carpenter's leadership will continue to bring meaningful and positive changes for Town of Islip residents as well as for our dedicated Town of Islip workforce."

Of Hofmeister's new role, Croci said in a statement: "He knows the issues facing our families at the local level and will be a great asset for our communities in his new role on the Senate Team."